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Downloaded the Corresponding Sequence bioRxiv preprint doi: https://doi.org/10.1101/027151; this version posted September 18, 2015. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 1 Structure and evolutionary history of a large family of NLR 2 proteins in the zebrafish 3 4 5 Kerstin Howe1*, Philipp H. Schiffer2,3*, Julia Zielinski2, Thomas Wiehe2, Gavin K. Laird1, 6 John C. Marioni14, Onuralp Soylemez5,6, Fyodor Kondrashov5,6,7, Maria Leptin2,3# 7 8 1 Wellcome Trust Sanger Institute, Cambridge, United Kingdom 9 2 Institut für Genetik, Universität zu Köln, Köln, Deutschland 10 3 The European Molecular Biology Laboratory, Heidelberg, Germany 11 4 The European Molecular Biology Laboratory, The European Bioinformatics Institute 12 (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridgeshire, United Kingdom 13 5 Bioinformatics and Genomics Programme, Centre for Genomic Regulation (CRG) 88 Dr. 14 Aiguader, 08003 Barcelona, Spain. 15 6 Universitat Pompeu Fabra (UPF), 08003 Barcelona, Spain. 16 7Institució Catalana de Recerca i Estudis Avançats (ICREA), 23 Pg. Lluís Companys, 08010 17 Barcelona, Spain. 18 *Contributed equally 19 Keywords: NACHT, B30.2, SPRY, Pyrin, gene family expansion, gene conversion, innate 20 immune system, genome evolution 21 Running title: Evolution and structure of the NLR-B30.2 family 22 23 [email protected], ORCiD: 0000-0003-2237-513X 24 [email protected], ORCiD: 0000-0001-6776-0934 25 [email protected] 26 [email protected] 27 [email protected], ORCiD: 0000-0003-2294-0135 28 [email protected], ORCiD: 0000-0001-9092-0852 29 [email protected], ORCiD, 0000-0001-8308-6855 30 [email protected] 31 [email protected], ORCiD: 0000-0001-7097-348X 32 33 #corresponding author: 34 Prof. Dr. Maria Leptin 35 EMBO Director 36 Director’s Research Unit 37 EMBO/EMBL Heidelberg 38 Tel: +49 (0)6221 8891101 39 Meyerhofstraße 1 40 69117 Heidelberg, Germany 41 42 All online supplementary material can be found on Figshare under the accession number 43 http://dx.doi.org/10.6084/m9.figshare.1473092 44 1 bioRxiv preprint doi: https://doi.org/10.1101/027151; this version posted September 18, 2015. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 45 ABSTRACT 46 Animals and plants have evolved a range of mechanisms for recognizing noxious substances 47 and organisms. A particular challenge, most successfully met by the adaptive immune system 48 in vertebrates, is the specific recognition of potential pathogens, which themselves evolve to 49 escape recognition. A variety of genomic and evolutionary mechanisms shape large families 50 of proteins dedicated to detecting pathogens and create the diversity of binding sites needed 51 for epitope recognition. One family involved in innate immunity are the NACHT-domain-and 52 Leucine-Rich-Repeat-containing (NLR) proteins. Mammals have a small number of NLR 53 proteins, which are involved in first-line immune defense and recognize several conserved 54 molecular patterns. However, there is no evidence that they cover a wider spectrum of 55 differential pathogenic epitopes. In other species, mostly those without adaptive immune 56 systems, NLRs have expanded into very large families. A family of nearly 400 NLR proteins 57 is encoded in the zebrafish genome. They are subdivided into four groups defined by their 58 NACHT and effector domains, with a characteristic overall structure that arose in fishes from 59 a fusion of the NLR domains with a domain used for immune recognition, the B30.2 domain. 60 The majority of the genes are located on one chromosome arm, interspersed with other large 61 multi-gene families, including a new family encoding proteins with multiple tandem arrays of 62 Zinc fingers. This chromosome arm may be a hot spot for evolutionary change in the 63 zebrafish genome. NLR genes not on this chromosome tend to be located near chromosomal 64 ends. 65 Extensive duplication, loss of genes and domains, exon shuffling and gene conversion acting 66 differentially on the NACHT and B30.2 domains have shaped the family. Its four groups, 67 which are conserved across the fishes, are homogenised within each group by gene 68 conversion, while the B30.2 domain is subject to gene conversion across the groups. 69 Evidence of positive selection on diversifying mutations in the B30.2 domain, probably 70 driven by pathogen interactions, indicates that this domain rather than the LRRs acts as a 71 recognition domain. The NLR-B30.2 proteins represent a new family with diversity in the 72 specific recognition module that is present in fishes in spite of the parallel existence of an 73 adaptive immune system. 74 2 bioRxiv preprint doi: https://doi.org/10.1101/027151; this version posted September 18, 2015. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 75 INTRODUCTION 76 The need to adapt to new environments is a strong driving force for diversification during 77 evolution. In particular, pathogens, with their immense diversity and their ability to subvert 78 host defense mechanisms, force organisms to develop ways to recognize them and keep them 79 in check. The diversity and adaptability of pathogen recognition systems rely on a range of 80 genetic mechanisms, from somatic recombination, hypermutation and exon shuffling, to gene 81 conversion and gene duplication to generate the necessary spectrum of molecules. 82 The family of NACHT-domain (Koonin and Aravind 2000) and Leucine Rich Repeat 83 containing (NLR) proteins (reviewed in Proell et al., 2008, Ting et al., 2008) act as sensors 84 for sterile and pathogen-associated stress signals in all multicellular organisms. In 85 vertebrates, a set of seven conserved NLR proteins are shared across a wide range of species. 86 These are the sensor for apoptotic signals, APAF1, the transcriptional regulator CIITA, the 87 inflammasome and nodosome proteins NOD1, NOD2, NOD3/NlrC3, Nod9/Nlrx1 and the as 88 yet functionally uncharacterized NachtP1 or NWD1 (Stein et al. 2007; Kufer and Sansonetti 89 2011). Other NLR proteins, which must have evolved independently of the conserved NLR 90 proteins, are shared by only a few species, or are unique to a species. Some non-vertebrates, 91 such as sea urchins or corals, have very large families of NLR-encoding genes (Bonardi et al. 92 2012), but an extreme example of species-specific expansion can be found in zebrafish (Stein 93 et al. 2007). Such species-specific gene family expansions suggest adaptive genome 94 evolution in response to specific environments, most probably different pathogens (Liu et al. 95 2013). 96 The zebrafish has become a widely used model system for the study of disease and 97 immunity (Rowe, Withey, and Neely 2014; Goody, Sullivan, and Kim 2014), and a good 98 understanding of its immune repertoire is necessary for the interpretation of experimental 99 results, for example in genetic screens or in drug screens. In a previous study we discovered 100 more than 200 NLR-protein encoding genes (Stein et al. 2007). The initial description and 101 subsequent analyses (Laing et al. 2008; van der Aa et al. 2009) have led to the following 102 conclusions: The zebrafish specific NLRs have a well-conserved NACHT domain 103 (PF05729), with a ~70 amino-acid extension upstream of the NACHT domain, the Fisna- 104 domain (PF14484, see this paper). This domain characterises this class of NLR proteins and 105 is found in all sequenced teleost fish genomes, but not outside the fishes (Stein et al. 2007). 106 The NLR proteins can be divided into four groups, each defined by sequence similarity in the 107 NACHT and Fisna domain, and these groups also differ in their N-terminal motifs. Groups 1 108 and 2 have death-fold domains; groups 2 to 4 contain repeats of a peptide motif that is only 3 bioRxiv preprint doi: https://doi.org/10.1101/027151; this version posted September 18, 2015. The copyright holder for this preprint (which was not certified by peer review) is the author/funder. All rights reserved. No reuse allowed without permission. 109 found in this type of NLR protein (Fig. 1). In the initial description, all of the novel NLR 110 proteins ended with the Leucine-Rich-Repeats, but it was later found (van der Aa et al. 2009) 111 that several of them had an additional domain at the C-terminus, an 112 SPRY/B30.2 domain (PF00622). This domain also occurs in another multi-gene family 113 implicated in innate immunity, the fintrims (van der Aa et al. 2009). 114 The initial identification of the genes and subsequent analyses by others (Laing et al. 115 2008) suffered from the limitations of the then available Zv6 assembly and gene annotations 116 (published in 2006). In particular, there was a limited amount of data available for long-range 117 assembly arrangements and a lack of supporting evidence for gene models, such as well 118 annotated homologues from other species. In addition, the very high similarity of the NLR 119 genes, as well as their clustered arrangement in the genome further complicated the assembly. 120 As a result, many genomic regions were collapsed and many of the gene models were 121 incomplete. We have revisited this gene family to improve the genome assembly in the 122 regions of interest, have manually re-annotated and refined the gene structures and here 123 provide a full description and analysis. Our re-annotation and analysis of the NLR gene 124 family in zebrafish, and comparison with other species, shows a structured set of more than 125 400 genes.
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